SIP User's Manual 206 Document #: LTRT-83310
Mediant 600 & Mediant 1000
14.6 Multiple SIP Signaling and Media Interfaces using
SRDs
The device supports the configuration of multiple, logical SIP signaling interfaces and
media (RTP) interfaces. Multiple SIP and media interfaces allows you to:
Separate SIP and media traffic between different applications (i.e., SAS, Gateway\IP-
to-IP)
Separate SIP and media traffic between different Layer-3 networks (e.g., when
operating with multiple ITSPs - separation of signaling traffic between different
customers). This separation allows you to use different routing rules, manipulations,
SIP definitions, etc. per network (customer). This is also applicable for networks
residing in the same or in different Layer-3 networks as the device. In such a scenario,
the device is configured with multiple SRDs.
Implement different SIP signaling ports (listening UDP, TCP, and TLS, and the UDP
source ports) for single or multiple interfaces.
Only one signaling interface per application type is allowed per SRD. An SRD can be
associated with many SIP interfaces which are based on one Layer-3 interface, with
different ports.
Multiple SIP and RTP interfaces are implemented using SRDs (Signaling Routing
Domains). An SRD is a set of definitions of IP interfaces, device resources, SIP behaviors
and other definitions that together create (from the IP user's perspective), multiple, virtual
multi-service gateways, from one physical device.
An SRD is composed of the following main entities:
Media Realm: A Media Realm is a range of UDP ports associated with a specific
Media-type IP interface (defined in the Multiple Interface table in 'Configuring IP
Interface Settings' on page 102). You can configure multiple Media Realms (each with
a specified UDP port range) for a specific media IP interface, thereby allowing you to
divide a media IP interface (RTP traffic) into a pool of media realms. Media Realms
are configured in the Media Realm table (see 'Configuring Media Realms' on page
169). Once configured, you can assign Media Realms to an SRDs (and/or IP Groups).
SIP Interface: A SIP Interface is a combination of UDP, TCP, and/or TLS ports
associated with a specific Control-type IP interface (defined in the Multiple Interface
table). Therefore, a SIP Interface represents a SIP signaling interface. SIP Interfaces
are configured n the SIP Interface table (see 'Configuring SIP Interface Table' on page
193) where they are assigned to SRDs:
• Each SIP Interface is defined with a unique signaling port (i.e., no two SIP
Interfaces can share the same port - no overlapping).
• SIP Interfaces assigned to a specific SRD ID must all be defined with the same
network interface (from the Multiple Interface table). For example, if you define
three SIP Interfaces for SRD ID #8, all these SIP Interfaces must be defined with
the same network interface (e.g., "SIP1").
• Each SIP Interface assigned to a specific SRD ID must be defined with a different
application type (i.e., SAS, Gateway\IP-to-IP). Therefore, up to two SIP Interfaces
can be assigned to a specific SRD.
Once configured, you can use an SRD as follows:
Associate it with an IP Group (see Configuring IP Groups on page 195).
Associate it with a Proxy Set (see Configuring Proxy Sets Table on page 200).
Define it as a destination SRD for IP-to-IP routing rules (see Configuring IP-to-IP
Routing Table). Routing from one SRD to another is possible, where each routing
destination (IP Group or destination address) indicates the SRD to which it belongs.
To Next Page
Loading...
